REVENUE RECOGNITION (Ticketing Contract Advances) (Details) - USD ($) $ in Thousands  | 
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021  | 
Jun. 30, 2020  | 
Jun. 30, 2021  | 
Jun. 30, 2020  | 
|
| Capitalized Contract Cost [Line Items] | ||||
| Amortization of non-recoupable ticketing contract advances | $ 28,728 | $ 32,126 | ||
| Ticketing [Member] | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Amortization of non-recoupable ticketing contract advances | $ 18,100 | $ 13,300 | 28,700 | 32,100 | 
| Prepaid Expenses [Member] | Ticketing [Member] | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Ticketing contract advances | 74,100 | 63,500 | 74,100 | 63,500 | 
| Other Noncurrent Assets [Member] | Ticketing [Member] | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Ticketing contract advances | $ 84,200 | $ 87,000 | $ 84,200 | $ 87,000 | 
| X | ||||||||||
- Definition The aggregate amount of recurring noncash contra revenue charged against earnings in the period to allocate the cost of non-recoupable ticketing contract advances over their estimated remaining economic lives. No definition available. 
  | 
| X | ||||||||||
- Definition Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
  | 
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
  | 
| X | ||||||||||
- Details 
  | 
| X | ||||||||||
- Details 
  | 
| X | ||||||||||
- Details 
  |